摘要
测试了减四线馏分油低温热容 ,并进行了热重 /微分热重 (TG/DTG)和差示扫描量热 (DSC)分析。在 80～ 373K温区 ,用高精度全自动绝热量热仪测定了热容值 ,用最小二乘法对实验测量值进行拟合 ,建立了热容随温度变化的多项式方程。从减四线馏分油的热容曲线 ,发现该样品从固相变为液相 ,存在着两个熔化峰 ,分别为 2 94 .17K和 331.5 7K ,后者为熔化主峰。以此为熔点 ,计算出熔化焓、熔化熵分别为 88.19J/g和0 .2 6 6 0J/ (K·g)。从TG/DTG分析曲线发现该油样在 5 73K开始失重 ,到 6 6 3K失重速度达到最大 ,可能是由于样品蒸发引起。从DSC分析曲线 ,发现样品除 333K附近出现熔化吸热峰外 ,在 5 73K到 873K范围还出现一系列吸热峰 ,可能与样品的蒸发和热分解有关。
Heat capacities of vacuum fourth oil (VFO) have been measured with a precision adiabatic calorimeter over the temperature range from 80 K to 373 K. The polynomial equation of specific heat vs temperature was established based on the experimental heat capacity data by the least square fitting method. The main melting point, melting enthalpy and entropy of the VFO were determined to be 331.57 K, 88.19 J/g, 0.266 0 J/(K·g) respectively. Evaporation and thermal decomposition of VFO was further studied through TG and DSC. The maximum weight loss occurred at about 663 K due to evaporation of VFO.
出处
《精细石油化工》
CAS
CSCD
北大核心
2003年第6期1-4,共4页
Speciality Petrochemicals
